Kinetics of crystallization of a Fe-based multicomponent amorphous alloy

摘要

The Fe-based multicomponent amorphous alloys (also referred to as metallic glasses) are known to exhibit soft magnetic properties and, it makes them important for many technological applications. However, metallic glasses are in a thermodynamically metastable state and in case of high temperature operating conditions, the thermally activated crystallization would be detrimental to their magnetic properties. The study of crystallization kinetics of metallic glasses gives useful insight about its thermal stability. In the present work, crystallization study of Fe_(67)Co_(18)B_(14)Si_1 (2605CO) metallic glass has been carried out using differential scanning calorimetry (DSC) technique. Mossbauer study has also been undertaken to know the phases formed during the crystallization process. The alloy shows two-stage crystallization. The activation energy has been derived using the Kissinger method. It is found to be equal to 220 kJ/mol and 349 kJ/mol for the first and second crystallization peaks, respectively. The Mossbauer study indicates the formation of alpha-(Fe, Co) and (Fe, Co)_3B phases in the alloy.